COVID-19 vaccines can provide safe, effective protection upon reinfection, provided the virus doesn’t wipe out the memory response of the human body.
Vaccines, as we know, don’t shield the body from infection. Instead, they equip the immune system with a sophisticated alarm system—one that will trigger a vigorous and rapid response whenever the invading virus sets off the alarm. Immune memory cells, trained by the vaccine to mobilize as soon as the alarm sounds, allow the body to target and clear out the virus in a matter of days, rather than weeks.
Based on the above knowledge, scientists theorize that if SARS-CoV-2 doesn’t wipe out memory response upon reinfection, it will help develop an effective vaccine. But if it does tamper with our immune memory, the vaccine development may face trouble.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.